XEP 0178 PEM password prompt despite no password on the p12 encrypted certificate

[deadheadjp]

While implementing the XEP 0178 in my libstrophe client, I used the easy-rsa generated certificates without password using the command:
./easyrsa --subject-alt-name="otherName:1.3.6.1.5.5.7.8.5;UTF8:[email protected]" gen-req "[email protected]" nopass

The nopass option means that the created certificate has no PEM password.

Following the chain of commands I finally export the certificate into p12 file and use it to authenticate with a server in my strophe based program using the provided API.
I am getting prompted about the PEM password in shell while running the program. I need to pass empty string "" to get through this step. As a workaround, I implemented a password callback that inputs the empty string automatically, but I presume that the password prompt should not be shown, or at least it could be documented that it happens and that the callback needs to be added.